Bathtub



FIG. 1 is a top plan view of a bathtub showing my new design;

FIG. 2 is a top plan view of a second embodiment thereof;

FIG. 3 is a front elevational view of FIG. 1;

FIG. 4 is a rear elevational view of FIG. 1;

FIG. 5 is a right side elevational view of FIG. 1; and

FIG. 6 is a left side elevational view of FIG. 1. 

The ornamental design for bathtub, as shown and described. 